( 407 ) 
XV. On new or little-known forms of Acraea, By H. E:rrine- 
HAM, M.A., F.Z.8.; with description of a new form of 
Acraea encedon, by Pror. E. B. Poutron, F.R.S. 
[Read June 4th, 1913.] 
Acraea orestia {. carpenteri. 
= orestia f. humilis, Eltr., Trans. Ent. Soc., p. 305, 1912 
(nec humilis, Sharpe). 
The description of this form is the same as that given 
by me (1. c. sup.). 
I am indebted to my friend Mr. N. D. Riley of the 
Natural History Museum for calling my attention to the 
fact that true A. humilis differs in certain important 
respects from the form of orestia which so closely resembles 
it. The acquisition of long series of examples of both 
these forms from the Mabira Forest, Uganda, has re- 
established the specific identity of A. humilis, and has once 
more emphasised the difficulty of correctly diagnosing 
specific distinctions in the absence of ample series of 
specimens. 
The long series referred to above were found by Mr. 
Riley to consist of individuals which varied from nearly 
scaleless forms, through a series of intermediates represent- 
ing the form I have described as transita (I. ¢.) up to the 
usual red hind-winged orestia. Further, the nearly scale- 
less examples are divisible into two groups, one having 
the sixth and seventh nervures of the hind-wing arising 
from a common stalk, whilst in the other these nervures 
arise independently from the cell in the usual manner. 
I have now examined the genitalia of the form in which 
the nervures arise from a stalk, and find that their structure 
differs from that in the unstalked form. It only remained 
to re-examine the type of humilis, when it was found that 
it exhibited the stalked condition of the nervures. Though 
described as a female it is actually a male. Both sexes 
occur in the above series, but there is no marked difference 
in external characteristics. Acraea humilis must therefore 
be restored to its position as a separate species, and a new 
name given to the form of orestia which so closely resembles 
it. For this I propose the name A. orestia f. carpenteri, 
TRANS. ENT. SOC. LOND. 1913.—PART II. (SEPT.) 
